package org.smart4j.chapter2.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class PropsUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     */
    public static Properties loadProps(String fileName) {
        Properties props = null;
        InputStream is = null;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if (is == null) {
                throw new FileNotFoundException(fileName + "file is not found");
            }
            props = new Properties();
            props.load(is);
        }catch (IOException e) {
            LOGGER.error("load properties file failure", e);
        }finally {
            if(is ==null) {
                try {
                    is.close();
                }catch (IOException e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

    /**
     * 获取字符型属性(默认值为空字符串)
     */
    public static String getString(Properties props, String key) {
        return getString(props,key,"");
    }

    /**
     * 获取字符型属(可指定默认值)
     */
    public static String getString(Properties props,String key, String defaultvalue) {
        String value = defaultvalue;
        if (props.containsKey(key)){
            value = props.getProperty(key);
        }
        return value;
    }

    /**
     * 获取数值型属性(默认为0)
     */
    public static int getInt(Properties props,String key) {
        return getInt(props,key,0);
    }
    /**
     * 获取数值型属性(可指定默认值)
     */
    public static int getInt(Properties props,String key,int defaultValue) {
        int value = defaultValue;
        if(props.containsKey(key)){
            value = CastUtil.castInt(props.getProperty(key));
        }
        return  value;
    }

    /**
     * 获取布尔型属性（默认值 false）
     */
    public static boolean getBoolean(Properties props,String key) {
        return getBoolean(props,key,false);
    }
    /**
     * 获取布尔型属性(可指定默认值)
     */
    public static Boolean getBoolean(Properties props,String key,Boolean defaultValue) {
        boolean value = defaultValue;
        if(props.containsKey(key)) {
            value = CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }
}
